Process of recovering potassium and aluminum from feldspar



kiln sulphurous gases produced in any deearner PROCESS 013 RECOVERING POTASSIUM AND ALUMINUM more:

No Drawing.

To all whom-it may concern:

Be it known that I, (.hm1ua-:s M. Brown, a subject of the King of Great Britain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Processes of Recovering Potassium and Aluminum from Feltispar, described in the following specification. I

This invention relates to a process or method of recovering potassium and aluminum found infeldspar and the principal objects of the invention are, to recover the maximum quantities of these materials at the minimum cost. I

The principal feature of the invention consists in treating" the feldspar at a moderate heat with sulphurous gases or sulphur dioxide S0,, to effect a re-action 'and chemical change of the substances contained in the feldspar.

In carrying this process into operation the feldspar is first finely crushed and it is then placed in a rotary kiln. preferably of the type used in the manut'zu-ture of cement, at a low temperature. At the lower end of the sir-able manner are admitted in such quantltv as to etlect a change oi the potassium and aluminum present in the feldspar to sulphates.

Feldspar is a silicate ot potassium and aluminum AlI\Sl;,() Sulphur dioxid S0,

or sulphurous gases united with oxygen when brought into contact with the feldspar forms sulphur trioxide S0, and sulphate of potassium K 94), and sulphate of aluminum \l. .(S() are thus formed.

Specification of Letters Patent.

ing out this process is less than introducing at the lower end of said Patented J Lil).

Application filed. February 25, 1920. Serial lilo. 361,1711.

Heat applied to the rotary kiln in carrywoe butthe heat of reaction between the sulphur dioxide and the elements of the telrlspar creates a chemical change of the desirable elements to sulphates. The'protlnct of the kiln is then leached in Water and the liquor thus obtained is evaporated in order to recover the sulphates.

A process such as described extremely simple, requires but the simplest form of apparatus and produces extraordinary re sults in the recovery of both potassium and. aluminum.

What I claim as my invention is z- 1. A process of recovering potassium and aluminum from feldspar, consisting in sub jecting thefinely ground feldspar to the action of sulphurous gases in the presence of air in a heated atmosphere to sheet -hange of the potassium and compounds to sulphates, then leaching the product in water and evaporating; the. same to recover the salts.

2. A process for recovering potassium and aluminum from feldspar, consisting in heat-- ing at a temperature of less than ltlOO finely ground feldspar within a rotary kiln, kiln sulphurous gases and air to produce fit), in sullicient quantity to ensure complete reaction with the potassium and aluminum compounds contained in the feldspar pro" ducing K 30, and AlJSth), and leaching the, product with water and Withdrawing; and evaporating the leaching liquid.

cHARLES M, neon/n,

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